20056979 has 2 divisors, whose sum is σ = 20056980. Its totient is φ = 20056978.

The previous prime is 20056973. The next prime is 20057021. The reversal of 20056979 is 97965002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20056979 - 2²⁰ = 19008403 is a prime.

It is not a weakly prime, because it can be changed into another prime (20056973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028489 + 10028490.

It is an arithmetic number, because the mean of its divisors is an integer number (10028490).

Almost surely, 2^20056979 is an apocalyptic number.

20056979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20056979 is an equidigital number, since it uses as much as digits as its factorization.

20056979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 20056979 is about 4478.5018700454. The cubic root of 20056979 is about 271.6992919195.

The spelling of 20056979 in words is "twenty million, fifty-six thousand, nine hundred seventy-nine".